Yes, the vast majority of 12 volt systems in the USA use what you are calling a "6 volt" coil. More then 75% of all cars and trucks with breaker points used that style. Same coil in a Deere 6 volt tractor is used in a Deere 12 volt tractor.
A 12 volt system has to make spark at 9 volts when cranking and at 13-14 volts when running. So various systems use differing strategies to accomplish the task. Ballast resistors, differing values in the primary and secondary windings, etc.
If you look closely, many 12 volt coils for sale also list usage for 6 volt systems.
The so-called "12 volt" coils have a higher resistance in the primary windings inside the coil and thus do not use an external resistor.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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